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authorCody P Schafer <cody@linux.vnet.ibm.com>2013-10-23 11:49:57 -0700
committerSteven Rostedt <rostedt@goodmis.org>2013-11-06 10:03:11 -0500
commitb2f974d6af9accfec11e69cc76d2ab9f0c7359e0 (patch)
tree23e54345bd0a6d4ca709bf104ce8f33ed6c44ccb /kernel
parentd562aff93bfb530b0992141500a402d17081189d (diff)
downloadop-kernel-dev-b2f974d6af9accfec11e69cc76d2ab9f0c7359e0.zip
op-kernel-dev-b2f974d6af9accfec11e69cc76d2ab9f0c7359e0.tar.gz
tracing: Open tracer when ftrace_dump_on_oops is used
With ftrace_dump_on_oops, we previously did not open the tracer in question, sometimes causing the trace output to be useless. For example, the function_graph tracer with tracing_thresh set dumped via ftrace_dump_on_oops would show a series of '}' indented at different levels, but no function names. call trace->open() (and do a few other fixups copied from the normal dump path) to make the output more intelligible. Link: http://lkml.kernel.org/r/1382554197-16961-1-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f9fa42b..eaacd3a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6276,6 +6276,17 @@ void trace_init_global_iter(struct trace_iterator *iter)
iter->trace = iter->tr->current_trace;
iter->cpu_file = RING_BUFFER_ALL_CPUS;
iter->trace_buffer = &global_trace.trace_buffer;
+
+ if (iter->trace && iter->trace->open)
+ iter->trace->open(iter);
+
+ /* Annotate start of buffers if we had overruns */
+ if (ring_buffer_overruns(iter->trace_buffer->buffer))
+ iter->iter_flags |= TRACE_FILE_ANNOTATE;
+
+ /* Output in nanoseconds only if we are using a clock in nanoseconds. */
+ if (trace_clocks[iter->tr->clock_id].in_ns)
+ iter->iter_flags |= TRACE_FILE_TIME_IN_NS;
}
void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
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